Main objective of this lecture is to present on Tornados. Tornados are Violently rotating column of air (Vortex) extending from a thunderstorm to the ground. Tornadoes are the most violent storms in nature. An average of 800 tornadoes are reported each year, resulting in 80 deaths and 1,500 injuries. Tornadoes are a worldwide phenomenon, touching down in every continent save Antarctica. Here also briefly describe on what is used to classify the intensity of tornados.